Dj Controller Download

[Eilene Balque]

Thedata processor processes personal data only on behalf of the controller. The data processor is usually a third party external to the company. However, in the case of groups of undertakings, one undertaking may act as processor for another undertaking.

The duties of the processor towards the controller must be specified in a contract or another legal act. For example, the contract must indicate what happens to the personal data once the contract is terminated. A typical activity of processors is offering IT solutions, including cloud storage. The data processor may only sub-contract a part of its task to another processor or appoint a joint processor when it has received prior written authorisation from the data controller.

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Action Controller is the C in MVC. After the router has determined which controller to use for a request, the controller is responsible for making sense of the request and producing the appropriate output. Luckily, Action Controller does most of the groundwork for you and uses smart conventions to make this as straightforward as possible.

For most conventional RESTful applications, the controller will receive the request (this is invisible to you as the developer), fetch or save data from a model, and use a view to create HTML output. If your controller needs to do things a little differently, that's not a problem, this is just the most common way for a controller to work.

A controller can thus be thought of as a middleman between models and views. It makes the model data available to the view, so it can display that data to the user, and it saves or updates user data to the model.

The naming convention of controllers in Rails favors pluralization of the last word in the controller's name, although it is not strictly required (e.g. ApplicationController). For example, ClientsController is preferable to ClientController, SiteAdminsController is preferable to SiteAdminController or SitesAdminsController, and so on.

Following this convention will allow you to use the default route generators (e.g. resources, etc) without needing to qualify each :path or :controller, and will keep named route helpers' usage consistent throughout your application. See Layouts and Rendering Guide for more details.

A controller is a Ruby class which inherits from ApplicationController and has methods just like any other class. When your application receives a request, the routing will determine which controller and action to run, then Rails creates an instance of that controller and runs the method with the same name as the action.

As an example, if a user goes to /clients/new in your application to add a new client, Rails will create an instance of ClientsController and call its new method. Note that the empty method from the example above would work just fine because Rails will by default render the new.html.erb view unless the action says otherwise. By creating a new Client, the new method can make a @client instance variable accessible in the view:

ApplicationController inherits from ActionController::Base, which defines a number of helpful methods. This guide will cover some of these, but if you're curious to see what's in there, you can see all of them in the API documentation or in the source itself.

Only public methods are callable as actions. It is a best practice to lower the visibility of methods (with private or protected) which are not intended to be actions, like auxiliary methods or filters.

Some method names are reserved by Action Controller. Accidentally redefining them as actions, or even as auxiliary methods, could result in SystemStackError. If you limit your controllers to only RESTful Resource Routing actions you should not need to worry about this.

You will probably want to access data sent in by the user or other parameters in your controller actions. There are two kinds of parameters possible in a web application. The first are parameters that are sent as part of the URL, called query string parameters. The query string is everything after "?" in the URL. The second type of parameter is usually referred to as POST data. This information usually comes from an HTML form which has been filled in by the user. It's called POST data because it can only be sent as part of an HTTP POST request. Rails does not make any distinction between query string parameters and POST parameters, and both are available in the params hash in your controller:

The actual URL in this example will be encoded as "/clients?ids%5b%5d=1&ids%5b%5d=2&ids%5b%5d=3" as the "[" and "]" characters are not allowed in URLs. Most of the time you don't have to worry about this because the browser will encode it for you, and Rails will decode it automatically, but if you ever find yourself having to send those requests to the server manually you should keep this in mind.

If your application exposes an API, you are likely to be accepting parameters in JSON format. If the "Content-Type" header of your request is set to "application/json", Rails will automatically load your parameters into the params hash, which you can access as you would normally.

Also, if you've turned on config.wrap_parameters in your initializer or called wrap_parameters in your controller, you can safely omit the root element in the JSON parameter. In this case, the parameters will be cloned and wrapped with a key chosen based on your controller's name. So the above JSON request can be written as:

The params hash will always contain the :controller and :action keys, but you should use the methods controller_name and action_name instead to access these values. Any other parameters defined by the routing, such as :id, will also be available. As an example, consider a listing of clients where the list can show either active or inactive clients. We can add a route that captures the :status parameter in a "pretty" URL:

In this case, when a user opens the URL /clients/active, params[:status] will be set to "active". When this route is used, params[:foo] will also be set to "bar", as if it were passed in the query string. Your controller will also receive params[:action] as "index" and params[:controller] as "clients".

Composite key parameters contain multiple values in one parameter. For this reason, we need to be able to extract each value and pass them to Active Record. We can leverage the extract_value method for this use-case.

When a user opens the URL /books/4_2, the controller will extract the compositekey value ["4", "2"] and pass it to Book.find to render the right record in the view.The extract_value method may be used to extract arrays out of any delimited parameters.

You can set global default parameters for URL generation by defining a method called default_url_options in your controller. Such a method must return a hash with the desired defaults, whose keys must be symbols:

If you define default_url_options in ApplicationController, as in the example above, these defaults will be used for all URL generation. The method can also be defined in a specific controller, in which case it only affects URLs generated there.

With strong parameters, Action Controller parameters are forbidden tobe used in Active Model mass assignments until they have beenpermitted. This means that you'll have to make a conscious decision aboutwhich attributes to permit for mass update. This is a better securitypractice to help prevent accidentally allowing users to update sensitivemodel attributes.

permits the specified key (:id) for inclusion if it appears in params andit has a permitted scalar value associated. Otherwise, the key is goingto be filtered out, so arrays, hashes, or any other objects cannot beinjected.

This marks the :log_entry parameters hash and any sub-hash of it aspermitted and does not check for permitted scalars, anything is accepted.Extreme care should be taken when using permit!, as it will allow all currentand future model attributes to be mass-assigned.

This declaration permits the name, emails, and friendsattributes. It is expected that emails will be an array of permittedscalar values, and that friends will be an array of resources withspecific attributes: they should have a name attribute (anypermitted scalar values allowed), a hobbies attribute as an array ofpermitted scalar values, and a family attribute which is restrictedto having a name (any permitted scalar values allowed here, too).

Hashes with integer keys are treated differently, and you can declarethe attributes as if they were direct children. You get these kinds ofparameters when you use accepts_nested_attributes_for in combinationwith a has_many association:

Imagine a scenario where you have parameters representing a productname, and a hash of arbitrary data associated with that product, andyou want to permit the product name attribute and also the wholedata hash:

The strong parameter API was designed with the most common use casesin mind. It is not meant as a silver bullet to handle all of yourparameter filtering problems. However, you can easily mix the API with yourown code to adapt to your situation.

Your application has a session for each user in which you can store small amounts of data that will be persisted between requests. The session is only available in the controller and the view and can use one of several of different storage mechanisms:

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